Then why is the teaching of it sacrosanct?
Whatever are you talking about?
Are you unaware of Darwinian eugenics?
Because it's perhaps the most important scientific theory in biological science. Kids in high school aren't taught much in the way of practical science- they're just given a broad spectrum of important scientific concepts and theories. They learn how to apply such theories if they pursue a science degree in college. We learned about a whole bunch of scientific concepts in high school with few, if any, real word applications in our lives.
Are you unaware of Darwinian eugenics?
Feel free to expound. This should be interesting. I'm guessing you're going to blame America's high abortion rate on the TOE.